BC¯¯¯¯¯ is parallel to DE¯¯¯¯¯. What is AC? Enter your answer in the box. units A triangle with vertices labeled as A, D, and E. Side D E is the base and the top vertex is A. Sides A D and A E contain midpoints B and C, respectively. A line segment is drawn from point B to C. Side A B is labeled as 8. Side B D is labeled as 10. Side C E is labeled as 15.